(WPF) XamDataGrid +分层+按需加载+动态列

这是我的版本。这基本上就是你要找的。在子字段布局中动态添加列，并相应地执行数据绑定

模型:

public class Country
{
    private string _name;
    public string Name
    {
        get { return this._name; }
        set { this._name = value; }
    }
    public ObservableCollection<State> States { get; set; }
}
public class State
{
    private readonly Dictionary<string, object> _info = new Dictionary<string, object>();
    /// <summary>
    /// Attributes of the state can be added dynamically (key will be the attribtue name etc...)
    /// </summary>
    /// <param name="key"></param>
    /// <returns></returns>
    public object this[string key]
    {
        get
        {
            return this._info[key];
        }
        set
        {
            this._info[key] = value;
        }
    }
    public string StateName { get; set; }
}

行为:

public class GridFieldLayoutBehaviour : Behavior<XamDataGrid>
{
    protected override void OnAttached()
    {
        base.OnAttached();
        this.AssociatedObject.FieldLayoutInitialized += OnFieldLayoutInitialized;            
        this.AssociatedObject.RecordExpanded += OnRecordExpanded;
    }
    void OnRecordExpanded(object sender, Infragistics.Windows.DataPresenter.Events.RecordExpandedEventArgs e)
    {
        ((ViewModel)this.AssociatedObject.DataContext).AddStateAttributes();
    }
    void OnFieldLayoutInitialized(object sender, Infragistics.Windows.DataPresenter.Events.FieldLayoutInitializedEventArgs e)
    {
        if( e.FieldLayout.ParentFieldName == "States")
        {
            ((ViewModel)this.AssociatedObject.DataContext).GridFieldLayout = e.FieldLayout;
        }            
    }
    protected override void OnDetaching()
    {
        base.OnDetaching();            
        this.AssociatedObject.FieldLayoutInitialized -= OnFieldLayoutInitialized;
        this.AssociatedObject.RecordExpanded -= OnRecordExpanded;
    }
}

ViewModel:

public class ViewModel
{
    #region Private Fields
    private readonly ObservableCollection<Country> _countries = new ObservableCollection<Country>();        
    private readonly List<string> _stateTotalAttributes = new List<string>();        
    #endregion
    public ViewModel()
    {
        FillData();
        var stateAttributes = new string[] {"Population", "Unemployment Rate", "Capital", "Governor", "TimeZone", "Area"};
        foreach (var stateAttribute in stateAttributes)
            _stateTotalAttributes.Add(stateAttribute);                            
    }
    public ObservableCollection<Country> Countries
    {
        get { return this._countries; }
    }
    public FieldLayout GridFieldLayout { get; set; }
    /// <summary>
    /// Country and the states are populated
    /// </summary>
    private void FillData()
    {
        var country = new Country();
        country.States = new ObservableCollection<State>();            
        country.Name = "USA";            
        var xdoc = XDocument.Load("states_data.xml");
        foreach (var state in xdoc.Descendants("states").Descendants())
        {
            var newState = new State();
            newState.StateName = state.Attributes("name").FirstOrDefault().Value;
            newState["Unemployment Rate"] = state.Attributes("unemployment-rate").FirstOrDefault().Value;
            newState["Capital"] = state.Attributes("capital").FirstOrDefault().Value;
            newState["Governor"] = state.Attributes("governor").FirstOrDefault().Value;
            newState["Area"] = state.Attributes("area").FirstOrDefault().Value;
            newState["TimeZone"] = state.Attributes("timezone").FirstOrDefault().Value;
            newState["Population"] = state.Attributes("population").FirstOrDefault().Value;
            country.States.Add(newState);
        }
        _countries.Add(country);
    }
    public void AddStateAttributes()
    {
        GridFieldLayout.Fields.BeginUpdate();
        // Remove the current columns (except for StateName)
        var removableFields = GridFieldLayout.Fields.Where(f => f.Name != "StateName");
        removableFields.ToList().ForEach(field => GridFieldLayout.Fields.Remove(field));
        // Figure out what state attributes to add
        var random = new Random(DateTime.Now.Millisecond);
        var numCols = random.Next(1, 6);
        var colsToAdd = GetStateAttributes(numCols, random);
        // Finally add the new ones'
        foreach (var col in colsToAdd)
        {
            var field = new UnboundField();
            field.Name = col;
            field.Binding = new Binding()
            {
                Mode = BindingMode.TwoWay,
                Path = new PropertyPath(string.Format("[{0}]",  col)),
                UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
            };
            GridFieldLayout.Fields.Add(field);
        }
        GridFieldLayout.Fields.EndUpdate();
    }
    private List<string> GetStateAttributes(int numCols, Random random)
    {            
        List<string> colsToAdd = new List<string>();
        for( int i = 0; i < numCols; i++)
        {
            int idx = random.Next(1, 6) - 1;
            if(colsToAdd.Contains(_stateTotalAttributes[idx]) == false)
            {
                colsToAdd.Add(_stateTotalAttributes[idx]);
            }
        }
        return colsToAdd;
    }
}

    <igDP:XamDataGrid DataSource="{Binding Countries}" >
        <i:Interaction.Behaviors>
            <local:GridFieldLayoutBehaviour/>
        </i:Interaction.Behaviors>
    </igDP:XamDataGrid>

States_Data.xml:

<states>
  <state name="New York" population="19,651,127" unemployment-rate="" capital="Albany" governor="Andrew Cuomo" timezone="EST" area="54,556 sq mi"></state>
  <state name="New Hampshire" population="1,323,459 " unemployment-rate="" capital="Concord" governor="Maggie Hassan" timezone="EST" area="9,304 sq mi"></state>
</states>

问候,Vishwa

我明白了

既然我不能粘贴代码(技术上讲，它属于我工作的公司)，我想我只能解释一下我做了什么。

我做了两个包装器，一个包装我的对象暴露/创建层次结构(AutoGeneratedColumns="True"，默认情况下，假设你的对象内部的对象的集合是你的对象的CHILDREN)，和一个ITypedList包装新的包装器，所以你可以动态地添加属性到它。

我希望这篇文章至少能有所帮助。